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I totally REJECT the concept of horoscopes as my fate is lead by HaShem and not by stars. They are just twinkling distant suns far far away in the galaxy and I deny that they DO influence my life. What really influences my life is how I act - this causes RE-actions and re-re-actions and so on.
Today's astrology has little to do with the old Jewish mazalot but is basically an islamic-Greek forthgoing concept. And I don't like the way many people put the stars just above HaShem and trust a star-worshipping-which more than the Torah! It was HaShem who created the stars in the order they are, and not the atrologists who basically are charlatans and often do not even believe themselves what they say.
As you said, Hashem created the stars and he created you. You cannot deny that there are forces outside you which influence your decisions. Hashem places everything in your world, just for you. He makes the wind blow, and the cosmic rays from distant stars. It is obvious that free will is influenced by the environment. We do not have control over everything around us.
BTW, I am not suggesting that 'horoscopes' or other modern gimmiks are actually anything to consider. But my point is that there are things outside of ourselves which can affect us.